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Once in the Sevren system the INTERSTRATCAF squadron proceeded to implement the plan assigned to it by Admiral Juillard and General Luchesi; the squadron blockaded the zenith and nadir jump points, deployed marine detachments on Sevren to impose martial law, replaced civilian leaders with military officers as the local commanders saw fit, and attempted to limit the ability of the seditious local populace to obtain or use weapons by detaining anyone found carrying such a weapon.[52]

The local population on Sevren reacted in a pattern that would soon become familiar to the Terran marines on many worlds as news of the rebellion was carried at considerable risk by blockade runners from world to world; many civilians retreated into the wilderness, and using weapons as primitive as staves and swords began an insurgency that used extensive guerilla tactics against the Terran Alliance forces. The marines controlled the cities, but were hampered by rules of engagement intended to preserve the colony and prevented them from conducting active genocide or using weapons of mass destruction. The knowledge possessed by the locals of the terrain gave them a huge advantage outside the cities, and guerillas frequently attacked military units travelling between settlements. Aided covertly by the crews of the iceships operated by the Ryan Cartel, the rebellion outlasted the will of the Alliance government to fight an insurgency across fifty worlds. Alliance forces and the Alliance government abandoned Sevren, leaving the world independent, along with the vast majority of the other settled worlds in the Inner Sphere.[4]

Severn was reclaimed by the Lyran Commonwealth in December, 3024. After driving the last Kurita 'Mech offworld the citizens began to rebuild their world. Fortunately the damage was limited to a relatively small area, which allowed the large agricultural concerns to re-plant the damaged land.[1]

The presence of radioactive metals in the planet's crust led to a healthy nuclear reactor industry. These power plants were used across the Commonwealth and Combine. Unfortunately the Nesmith Nuclear Industries plant exploded the day after the last Kuritan DropShip left the world. The explosion scattered radioactive materials over several square kilometers, including the city of New Cartris. The resulting cleanup activity took three years, but was completed in early 3028.[1]

In November 3051 Sevren came under attack from Clan Wolf as part of the renewed Fifth Wave of Operation Revival. Rich in mineral deposits and agricultural output the planet was a prestigious target, defended by the 25th Arcturan Guards under the veteran Hauptmann GeneralGilda Felra, and so saKhanGarth Radick pulled rank to ensure his Beta Galaxy won the bid to invade Sevren. Beta Galaxy made their landing on the continent of Carlisle, but were immediately attacked by the Arcturan Guards at Dinton Acres; although the battle was inconclusive it effectively blunted the Wolves' offensive. A second inconclusive battle was fought at Oisten Green, but in the succeeding fight at Bassingale the 3rd Battle Cluster exploited a gap in the Guards' line to penetrate their rear before reinforcements could arrive, putting the Lyrans on the defensive. When at the battle of Mt. Ripchuck a unit of Headhunters destroyed a battalion headquarters, General Felra ordered a retreat and the Arcturan Guards fled to Colmar.[54]